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D. G. ROOSI JACK. APPLICATION'FILED JULY 17,1916.

' 1,324,851 Patented Dec. 1(5, 191%).

3 SHEETS-SHEET I.

D. G. ROOS.

JACK.

APPLICATION FILED JULY 17. 1916.

1 24,851 Patented Dec. 16,1919.

3 SHEETSSHEET 3.

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' JZeZma/z" $155008.

UNITED STATES PATENT OFFICE.

DELMAR G. 3003, OF BRIDGEPORT, CONNECTICUT, ASSIG-NOR TO THE LOCOMOZBILE COMPANY OF AMERICA, OF NEW YORK, N. Y., A CORPORATION OF WEST VIR- G-INIA.

JACK.

Specification of Letters Patent.

Patented Dec. 16; 1919.

Application filed July 17, 1916. Serial No. 109,626.

To all whom it may concern:

the lifting screw is operated by a motor.

The character of the invention may be best understood by reference to the follow ing description of an illustrative embodiment thereof shown in the accompanying drawings, wherein Figure 1 is a side elevation of an illustrative lifting jack shown herein as embodying the invention;

Fig. 2 is a verticalsection through the jack shown in Fig. 1;

Fig. 3 is a horizontal section taken on line 33 of Fig. 2;

Fig. 4 is a vertical section taken on line HofFigir; I

b Fig. 5 is a plan view of-the switch mem- Fig. 6 is a section on line 6'- 6 of Fig. 5;

and

Figs. 7 and 8 are wiring diagrams showing electrical connections for controlling the motor and brake, and illustrating the action of the switch.

Referring to the drawings, the illustrative lifting jack shown therein as embodying the invention comprises abase 1 (Figs. 1 and 2) on which is mounted and secured a casing 8 formed to present a motor receiving shell or socket 5, a hollow standard 7 and a handle 9.

In said standard is an elongated sleeveor nut 11 free to slide vertically, but confined against rotative movement by the rectangular shape of the interiorofsaid standard. The upper end of saidsleeve is formed to present a head 15 which may serve to en-' gage the thing to be lifted. A screw 17 is threaded into said sleeve and when rotated will lift or lower the sleeve according to the direction in which said screw is turned.

An important feature of the invention relates to a motor mechanism for rotating said screw. To accomplish this said screw has alower reduced end 19 keyed to the hub of a large gear 21 and preferably projecting somewhat beyond the lower face of said gear into a bearing 23. The lifting thrust of'the screw reacts through the hub of the gear to the base 1 Where a ball bearing 25 is provided to-reduce the friction between them.

The large gear 21 is driven by a pinion 27 formed on a stud shaft 29 depending from a spider 31 and journaled in a bearing 33 in the base 1 and a bearing 35 formed in a lining 37 within and fast to the motor shell 5 re e rred to. The spider 31 has stud shafts 39 projectin upward therefrom on which are journaled planetary pinions 11 meshing with an internal gear 43 formed on the inner surface of said lining. The planetary pinions 41 are driven by a sun gear 15 on the rotor, herein the armature shaft 47, of an electric motor 49. The lower end of this motor and hold the same in position. When it is desired to remove said motor for purposes of replacement or repair, it is simply necessary to release said screw, and then the motor, together with its sun gear, may be lifted out of said shell.

Next will be described means for control ling the starting, stopping and direction of rotation of said motor. To accomplish this there is preferably provided a switch device such as that shown in detail in Figs. 5 and 6. .This switch is adapted to be held in the hand and may be connected to the jack by any desired length of conductor, as indicated in Fig. 1. The switch as shown in Figs. 5 and 6 comprises opposed cup shaped members 55 and 57 fitting other and connected by the smooth bolt 59 andnut 61 so that one may rotate relatively to the other.

The cup member 55 contains rubber or other insulation material 65 in which are embedded fixed terminals, and the member 57 contains rubber or other insulation maone within the terial' 67 recessed to receive bridge contacts for making and breaking the electrlcal connections between said termmals as more a fully hereinafter described.

,wire 0 with the terminal 79. The terminal 7 9 is connected by the contact 81 with the terminal 83 from which the wire at leads to the armature 85. From the armature 85 the wires e and f successively lead to the terminal 87 connected by the contact 89 to terminal 91 from which the wire 9 returns to the battery. Connected in parallel with the wire f by means hereinafter more fully described is a wire 72. leading to the terminal 93.

The electrical connections described are adapted to cause the current to flow in opposite directions throu h the motor armature to change the direction of rotation thereof according to whether the lifting, sleeve is to be elevated or lowered. When the switch is in the position shown in Fig. 7, the current passes from the battery through the wire a, the switch 71, bridge contact 73, the terminal 75. It'passes thence through wire I), field coil 77, wire 0, terminal 79, bridge contact 81, terminal 83, wire cl, the motor armature 85 and thence through the wire f, terminal 87, bridge contact 89,

' terminal 91, wire 9 back to the battery.

' shifting the switch reverses the current in After the switch member 57 is turned in a clockwise direction to its osition shown in Fig. 8, it will cause the bridge contact 73 to separate from the terminal 75 and connect the terminals 71 and 93, cause the bridge contact 81 to separate from the terminal 79 and to connect the terminals 83 and 75, and the bridge contact 89 to separate from terminal 87 and connect termi nals 91 and 79. Now the current'will pass from the battery through the wire a, terminal 71, contact 73, terminal 93, wires h and c to the armature 85. Hence it passes through the wire at to the termina 83, through brid e contact 81 to te'rmina 75,

thence throug the wire I) to the motor field" coil 77 and through the wire 0, terminal 79, contact 89, terminal 91 and wire 9 back to the battery. It is evident from the diagrams in Figs. 7 and 8 wherein the direction of the current is indicated by arrows that the'armature 85 and therefore reverses the motor. 'Stoppage or reversal of the motor may take place at any point in the travel of the screw 17.

The motor may be controlled by the manually operated switch member and means ,member 99 on the side of the jack and spaced for a distance corresponding substantially to the normal travel of the sleeve. The wire 6 is connected to a bus-bar 101 fastened to the contactors 95 and 97 by means of insulated bolts 103, best shown in Fig. 1.

As the connections of the wires 72. and f are substantially similar, a description of the upper one shown in Fig. 1 will sufiice. The

terminal 95 may-be put into electrical communication with the bus-bar 101 by means of a switch 105 in the form of a lever pivoted on the insulated pin 107 and normally held in contact with parts 95 and 101 by the spring 109. The switch for the wire 71 is the same as that for the wire 7 but is reversed in position swinging downwardly instead of upwardly when removed from the parts 97 and 101. As is apparent from the description already given of the connections of the motor the current, when the head 15 is being raised, passes through the upper switch 105 and the wire f and when it is being lowered through the lower switch and the wire h. The automatic stoppage of the motor is affected through these switches 105 as follows:

The lifting sleeve 11 carries a pin 111 provided with an insulating bushing 113 and projecting through the elongated slot 115 (Fig. 1) in the standard 7. As clearly shown in Fig.1, the switch levers 105 cross the ends of this slot in the path of the pin 111. It is apparent that as the sleeve 11 is raised thepin 111 will travel upwardly in the slot 115 and as the sleeve reaches the upward limit of its travel will strike the upper switch 105 throwing it clear of the busbar 101 and contactor'95, thus breaking the circuit to the wire 7 and stopping the motor. When the motor is reversed and the sleeve descends the spring 109 will return the switch 105 to its place. Also when the "sleeve reaches the lower limit of its travel the pin 111 will throw the lower switch 105 breaking the circuit to the wire it in an exactl similar manner.

, T e switch levers 105 are made quite long and the pin 111 is arranged to strike the same quite near their pivots. By such a design of the arts the action of the pin 111 in moving s owly against the switch levers 105 is multiplied in a large ratio so that the contact is very quickly broken between disk bya helical spring 119 confined between said shoe and a cap 121 m0unted on and secured to the motor. To prevent rotation of said brake shoe relatively to said casing, the shoe is notched to receive lugs 123 fast on the inner face of said casing.

To release said shoe from said disk, there is provided asolenoid 125 encircling said shoe, the latter being formed to serve as a core entered centrally in the solenoid coil. When the coil is energized the shoe is drawn upward against the resistance of the spring 119 away from the disk.

The coil should be energized to withdraw the shoe from the disk when it is desired to rotate the motor. To accomplish this the ficient motor-actuated lifting jack having many advantages. The train of gears including the planetary gears provides a desirable speed reduction from the motor to the screw which enables heavy loads to be lifted with a small power motor. The casing completely incloses the gear transmission and may be filled withvlubricating material to maintain a continuous easy operation of the gear mechanism. The casing in completely inclosing the gear mechanism protects the same from dirt and other forelgn matters which, if admitted, would be likely to cause objectionable wear and injuries to the mechanism. The transmission. mechanism is compactly arranged, thereby permitting the same to be incased in a small casing, reducing the bulk of the jack as a whole and contributing to the lightness and ease of manipulation thereof. 7

It should be understood that the particular mechanism shown in the drawings is merely one embodiment selected to illustrate the invention, and that extensive deviations may be made therefrom without departing from the spirit and scope of the claims.

What I claim as new and desire to scour by Letters Patent is 1. In a lifting jack a base, a standard rising therefrom, a lifting member movable in said standard, a socket on said base having clamping means associated therewith, a transmission train extending from said lifting member and having an element Within said'socket and a motor fitting said socket and clamped theretoand having a rotor engaging said element.

2. The construction defined in claim 1 wherein the element comprises planet gears and the rotor is the sunthereof.

3. In a lifting jack a base, a standard rising therefrom, a lifting member movable in said standard, a socket in said base, a transmission train for said member housed in said base and having a driven element presented within said socket, an electric motor having a casingfitting said socket and a rotor projecting into driving engagement with said element, a cap 'on the opposite end of said casing, a brake shoe in said cap cooperating with the rotor and means controlled by the motor circuit for operating the ,shoe.

4. In combination, a lifting jack comprising a standard and a lifting membervertically movable therein, an electric motor for operating said member, an automatic brake associated with said motor and effective on stopping thereof, and means for interrupting the current to the-motor when the member reaches predetermined positions of elevation and depression.

5. In combination, a lifting jack comprising a' standard and a lifting member vertically movable therein, an electric motor for operating said member, 'an automatic brake associated with said motor and effective on stopping thereof, means for controlling the direction of rotation of the motor and means for interruptin the current to the motor when the memdoer reaches predetermined positions of elevation and depression said means acting to place the motor in readiness for reversal.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

DELMAR G. ROOS.

Witnesses:

R. E. LooKwooD, CHAS. L. LEFLER. 

